AirHint found the following cheapest return flights from Cardiff (CWL) to Amsterdam (AMS) in September 2025 (see full year).

Return flights

09 Sep - 10 Sep	Ryanair
23 Sep - 26 Sep	Ryanair
16 Sep - 19 Sep	Ryanair
18 Sep - 20 Sep	Ryanair
20 Sep - 27 Sep	Ryanair
25 Sep - 01 Oct	Ryanair
22 Sep - 24 Sep	Ryanair
27 Sep - 01 Oct	Ryanair
27 Sep - 27 Sep	Ryanair
27 Sep - 30 Sep	Ryanair
25 Sep - 30 Sep	Ryanair
09 Sep - 13 Sep	Ryanair
29 Sep - 07 Oct	Ryanair
29 Sep - 07 Oct	KLM	direct
25 Sep - 01 Oct	KLM	direct
29 Sep - 03 Oct	Ryanair
29 Sep - 03 Oct	KLM	direct

Also check the deals for one-way flights from Cardiff to Amsterdam in September.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Cardiff to Amsterdam in September from $152

Return flights